Question

The oxidation of toluene to benzaldehyde by chromyl chloride is called:

• A. Etard reaction
• B. Riemer - Tiemann reaction
• C. Wurtz reaction
• D. Cannizzaro's

Answer 1

Answer: (A)

Etard reaction

The oxidation of toluene $(C_6{H}_{5}C{H}_3$ with chromyl chloride $\left(CR{O}_{2}C{l}_2\right)$ in $CC{l}_4$ or $C{S}_2$ to give benzaldehyde is called Etard reaction. In this reaction, the chromyl chloride first forms a brown complex, which is seperated and then decomposed with $H_{2}O$ to give benzaldehyde $\left(C_6{H}_{5}CHO\right).$